MVS Jan 2005.p65 - CBT Tape

A tinit() function call is used to define the parallel load
module that will be used for multi-tasking requests as well
as the maximum number of concurrent requests that can
be active.
A tsched() function call is made (to a CSECT that exists in
the tinit() requested load module) to activate an MTF
subtask.
A tsyncro() function call is used to clean up resources and
wait for the completion of any tsched() initiated requests.
A tterm() function call terminates the currently defined
MTF environment.
MTF has the following drawbacks:
The number of possible concurrent requests is restricted
by the tinit() set-up function.
All possible multi-tasking routines must be included in the
tinit() parallel function load module.
If an abend occurs in any tsched() request, the active MTF
environment becomes ineligible for use and must be
terminated and reinitialized before further MTF activity
can occur.
It requires a POSIX(OFF) environment.
ANOTHER OPTION
For anyone familiar with the ATTACH Assembler macro, the
multi-tasking technique just discussed that most closely
resembles ATTACH is the pthread_create() function. The
drawbacks of the pthread_create() function are just sufficient
to warrant the creation of a new function pair, ATTACH() and
DETACH(). The ATTACH() function is capable of attaching
programs that are available in an address space’s program
search order. The ATTACH() function requires a minimum of
five parameters. All parameters in excess of the minimum are
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